13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Atiesh63Hand of Sargeras
Deathchill Servant61
Pallid Horror60
Stormwind Elite Guard60
Ghost of Naxxramas60
Portal of Shadows1
Soldier of the Frozen Wastes60
Unstoppable Abomination60
Soul Weaver60
Ashbringer Trigger1
Undercity Elite Guardian60
Fairbanks Transformed1
Highlord Mograine63The Ashbringer
Guardian of Icecrown60
Terky1
She number one60CocaCola Ambassador
She number two60CocaCola Ambassador
She number three60CocaCola Ambassador
Poley1
Blizzard63
Web Wrap60
Argent Horse1
Argent Warhorse60
Argent Charger63
Argent Mount1
Argent Deathsteed1
Argent Deathcharger1
test: saved world state1
Speedy1
Mr. Wiggles1
Whiskers the Rat1
Midsummer Bonfire1
Midsummer Bonfire Despawner1
Giant Claw Tentacle Test60
Void Zone63
Corpse Scarab60
Spirit of Summer1
Spirit of Mograine63The Ashbringer
Spirit of Blaumeux63
Spirit of Zeliek63

Classic reference data from QuestieDB (Forever data, commit c5de61a), with positions on Forever's zone maps. It doesn't confirm that an NPC, location, quest or item is in Forever.